title: Orientating layers with adjustable pretilt angles for liquid crystals deposited by a linear atmospheric pressure plasma source.
abstract: A method for controlling the pretilt angles of liquid crystals (LC) was developed. Hexamethyldisiloxane polymer films were first deposited on indium tin oxide coated glass plates using a linear atmospheric pressure plasma source. The films were subsequently treated with the rubbing method for LC alignment. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy measurements were used to characterize the film composition, which could be varied to control the surface energy by adjusting the monomer feed rate and input power. The results of LC alignment experiments showed that the pretilt angle continuously increased from 0° to 90° with decreasing film surface energy.
authors.affiliation: Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan.
authors.forename: Shih-Jie
authors.initials: SJ
authors.lastname: Jian
authors.forename: Chwung-Shan
authors.initials: CS
authors.lastname: Kou
authors.forename: Jennchang
authors.initials: J
authors.lastname: Hwang
authors.forename: Chein-Dhau
authors.initials: CD
authors.lastname: Lee
authors.forename: Wei-Cheng
authors.initials: WC
authors.lastname: Lin